Translating Dwarven Runes

I'm sure this kind of thing exists somewhere, but i suck at stuff like this.

Runes in "The Hobbit" contains a description of how to translate the map that bilbo gets, apprently. I downloaded that font and everything...

But then I went to watch the movie, and tried to translate Balin's tomb. Not only do the letters not make sense - some of them don't even exist!

Any help?